Drilled Shaft Calculation

7/25/2019 Drilled Shaft Calculation

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Job Name: Shaft 1-2-3 : Drilled Shaft Design Program (Version 4.3)

Job Location: University of Soth !lorida

Engineer: Danny "inters (#evised: $2%14%2$12)

Shaft Diameter 1: 3 ft Displacement Criteria: 1 in

Shaft Diameter 2: ft Dead Load Factor: 1.2

Shaft Diameter 3: ft End !earing "nfl#ence $one: 3 diameters

C#t%off & Sco#r Ele'ation: ( ft )ress#re Limit: *( psi

Shaft Capacit+ Design ,ethods

Side Shear -nal+sis ,ethod End !earing -nal+sis ,ethod

Cla+:

Silt:

Sand:

Limestone:

Alpha Method AASHTO

Most Conservative AASHTO (Clay Method)

O'Neill and Hassan (1994) Reese and O'Neill (1988)

AASHTO FHWA (1998)



!oring N#mber:

ro#nd S#rface Ele'ation: ft

/ater 0able Ele'ation: ft

Ele'ation DepthS)0%N Soil 0+pe

oc Coring "nform

ft4 ft4 psi4 psi4

5#

5s



ation 6ser Defined

eco'er+

7 0SF4

f s



Nomenclat#re

&# ' erent reovery of ro* oring (&)

α '

β '

'

D ' diameter of drilled shaft (!+)

'

' diameter of the ti of a drilled shaft (!+)

' angle of internal frition of soil (D,)

' nominal nit shear resistane (+S!)

γ ' nit eight (f)

P/ ' rot Pressre /nde0 (D/)

* ' emirial earing aaity oeffiient (D/)

' load transfer fator

'

' earing aaity fator (D/)

' orreted SP+ lo ont

'

'

' ndrained shear strength (+S!)

+5 ' +i 5aaity ltilier (D/)

' vertial effetive stress (+S!)

adhesion fator alied to S (D/)

oeffiient relating the vertial stress and the nits*in frition of a drilled shaft (D/)

βm

SP+ orreted oeffiient relating the vertialstress and the nit s*in frition of a drilled shaft(D/)

D

deth of emedment of drilled shaft into a earingstratm (!+)

D

φ, φf

f s6 7

s

average (norreted) Standard Penetration +est lo ont6 SP+ (8los%!+)

orr

7s

average slitting tensile strength of the ro* ore(+S!)

7

average nonfined omressive strength of thero* ore (+S!)

S

σ9v



)roced#res Commentar+

S,5U#/+ ;+,:

eneral /orsheet

,nter 8oring <og /nformation

U to three shaft diameters an e analy=ed.

irosoft >P sers mst set Security Level in Macro Security to Medium. +his is done in Tools -Options - Macro Security - Security Level .

,nter Job Name Job Name mst e entered efore analysis is rn.

,nter Job Location Job Location is otional.

,nter Engineer Engineer is otional.

+he Boring Log or*sheet an e dislayed yli*ing the Boring Log tton or li*ing on the

Boring Log sheet ta at the ottom of ,0el (see

)roced#res 8 Commentar+ for Boring LogWorksheet elo).

Selet "or*ing Units ,nglish or etri nits an e seleted for enteringra data. +he or*sheet ill onvert from,nglish nits to etri nits and vie versa. +heanalysis ill atomatially se ,nglish nits forthe allations.

,nter Shaft iameter!s"

,nter isplacement #riteria isplacement #riteria defines the moili=ed end earing and side shear in either ohesionless orohesive soils as a fntion of a +i 5aaityltilier (+5) and Side Shear ltiliers(SS)6 resetively6 ased on #eese and ;9eill1?@@ (see !igres 1 throgh 4). +5 er limits(ngroted shafts) are set at 1.$ for oth ohesiveand ohesionless soils. SS er limit forohesionless soils is set at 1.$ and linearlye0traolated for ohesive soils eyond 2&. Silt isdeendent on the analysis method seleted (sand orlay). ,nd earing in limestone is deendent onthe nonfined omressive strength and erentreovery. Side shear for limestone is set at 1.$ for

all &D dislaements.



!igre 1 - ormali=ed <oad +ransfer in ,nd 8earing Verss Settlement in 5ohesionless Soils for DrilledShafts (after #eese and ;9eill 1?@@)

!igre 2 - ormali=ed <oad +ransfer in ,nd 8earing Verss Settlement in 5ohesive Soils for DrilledShafts (after #eese and ;9eill 1?@@)



!igre 3 - ormali=ed <oad +ransfer in Side #esistane Verss Settlement in 5ohesionless Soils forDrilled Shafts (after #eese and ;9eill 1?@@)

!igre 4 - ormali=ed <oad +ransfer in Side #esistane Verss Settlement in 5ohesive Soils for DrilledShafts (after #eese and ;9eill 1?@@)



,nter ead Load $actor ead Load $actor is sed to strat the eight ofthe shaft from the moili=ed aaity. +he defaltvale reflets the AASB+; <#!D 8ridge DesignSeifiations (/nterim 2$$3).

,nter End Bearing %nfluence &one +he End Bearing %nfluence &one defines the deth elo the ti of the shaft that ontrites to theend earing aaity y finding the minimm 5

p

from the soils don to the deth defined y this arameter.



(See 5ommentary elo)

Soil Parameters

!igre 3 - Soil Unit "eight - Standard Penetration +est (SP+ - ) #elationshis

,nter #ut'off ( Scour Elevation Defalt #ut'off ( Scour Elevation is )round Elevation. #ut'off ( Scour Elevation elo)round Elevation ill negate that soil in theeffetive stress allations.

,nter )rout *ressure Limit +he )rout *ressure Limit is ased on the grotingmehanism aaity (defalt ' C$ si).

Selet Analysis ethods for Side Shear and ,nd8earing

5li* #alculate Shaft #apacities #alculate Shaft #apacities ill allate shaftaaities ased on the oring log. +he grotedti aaity ill then e analy=ed ased on thealied grot ressre (llins6 et al.6 2$$1).

5li* +eset ,or-boo- (otional) +eset ,or-boo- ill lear all sheets inlding the Boring Log or*sheet.

1((

1(

11(

11

12(

12

13(

13

( 1( 2( 3( 9( ( :( *( ;(

S)0 N

6 n i t / e i g h t 3 p c f

Cla+ Silt

Sand



5lay

Silt

Sand

<imestone

S

' 12 E sf (lhay and ayne6 1??$)6

here is the standard enetration test nmer.

S

' 12 E sf (lhay and ayne6 1??$)6

here is the standard enetration test nmer.

(See +ale 1 for φ vales)

+ale 1 - Vales for φ ased on SP+ - vales

76 7

s6 and erent reovery are defined y the ser

in the Boring Log or*sheet.



Side Shear Analysis Methods

#lay

AASB+; +ale [email protected]

.lpha Method

User efined

Silt

O/Neill and 0assan !1223"

.lpha Method

Most #onservative

(See AASB+; setion [email protected])

f s ' α E S

6 here S

is the mean ndrained shear

strength (+S!) and α is the adhesion fator (D/)

(see AASB+; +ale [email protected]). +heallations aont for the to five feet hih isnonontriting.

fs is defined y the ser in the Boring Log or*sheet (+S!). +he side shear defined y theser is for that seifi elevation and derived fromload testing reslts. /f load testing reslts are notavailale6 then another method shold e seleted.

Also *non as the odified 8eta ethod. /fSP+ F 1 then

βm ' SP+ % 1 E β

(#eese and ;9eill6 1?@@).

(See AASB+; setion [email protected])

f s ' α E S

6 here S

is the mean ndrained shear

strength (+S!) and α is the adhesion fator (D/)

(see AASB+; +ale [email protected]). +heallations aont for the to five feet hih isnonontriting.

Most #onservative method ill rn throgh theallations for eah analysis method and se themost onservative vale.



User efined fs is defined y the ser in the Boring Log or*sheet (+S!). +he side shear defined y theser is for that seifi elevation and derived fromload testing reslts. /f load testing reslts are notavailale6 then another method shold e seleted.



Sand


O/Neill and 0assan !1223"

+eese and O/Neill !1244" (See AASB+; +ale [email protected])

+eese and ,right !1255" (See AASB+; +ale [email protected])

6uiros and +eese !1255" (See AASB+; +ale [email protected])

Meyerhof !1257" (See AASB+; +ale [email protected])

Also *non as the odified 8eta ethod. /fSP+ F 1 then

βm ' SP+ % 1 E β

(#eese and ;9eill6 1?@@).



Touma and +eese !1258" (See AASB+; +ale [email protected])

Most #onservative

User efined

Limestone

Mc9ay and To:nsend !122;"

User efined

End Bearing Analysis Methods

#lay

Silt

+eese and O/Neill !1244" (See AASB+; +ale [email protected])EE

Most #onservative method ill rn throgh theallations for eah analysis method and se themost onservative vale.

fs is defined y the ser in the Boring Log or*sheet (+S!). +he side shear defined y theser is for that seifi elevation and derived fromload testing reslts. /f load testing reslts are notavailale6 then another method shold e seleted.

fs ' 1%2 E 71%2 E 7s1%2 E &#here: 7 is the nonfined omressive strengthof the ro* (+S!)6 7s is the slitting tensile

strength of the ro* (+S!)6 and &# is the erentreovery.

..S0TO (<imestone) (See AASB+; setion [email protected]. ([email protected] [email protected])) !or 7

F' 2$ +S!6 f

s ' $.1 E 7

and

for 7 H 2$ +S!6 f

s ' $.IC E 7

$.6 here 7 is the

nonfined omressive strength of the ro*(+S!).

fs is defined y the ser in the Boring Log or*sheet (+S!). +he side shear defined y the

ser is for that seifi elevation and derived fromload testing reslts. /f load testing reslts are notavailale6 then another method shold e seleted.

..S0TO (5lay) (See AASB+; setion [email protected])7

'

E S

F' 4$.$ +S!6

here ' I J 1 K $.2 ( L % D ) M F' ?6 D is

the diameter of drilled shaft (!+)6 L is the enetration of shaft (!+)6 S

is the ndrained shear

strength (+S!). Also *non as #eese G ;9eill1?@C.



..S0TO (5lay) (See AASB+; setion [email protected])7

'

E S

F' 4$.$ +S!6

here ' I J 1 K $.2 ( L % D ) M F' ?6 D is

the diameter of drilled shaft (!+)6 L is the enetration of shaft (!+)6 S

is the ndrained shear

strength (+S!).



Sand


+eese and O/Neill !1244" (See AASB+; +ale [email protected])EE

+eese and ,right !1255" (See AASB+; +ale [email protected])EE

Meyerhof !1257" (See AASB+; +ale [email protected])EE

Touma and +eese !1258" (See AASB+; +ale [email protected])EE

Limestone

$0,. !1224"

Grouted End Bearing Analysis

)rout *ressure %nde< !)*%"

EE(See AASB+; setion [email protected]) !or diameters greater than 4.1C !+6 7 is reded as follos:7

r ' 4.1C % D

E 7

6 here D

is the ti diameter of the drilled shaft (!+).

,nd 8earing6 7 ' 2. E 7

E &#eovery F' 4$.$

+S!6 here 7 is the nonfined omressive

strength of the ro* (+S!).

rot Pressre /nde0 is a non-dimensional ratio ofthe alied grot ressre to the reditedngroted end earing at &D.



Tip #apacity Multiplier !T#M"

!igre 4 - +i 5aaity ltilier for determining the groted end earing aaity in ohesionless soils.

+i 5aaity ltilier at &D is e7al to thegroted aaity at &D divided y the ltimateallated end earing. +he groted aaity asdetermined from load test data (llins6 et al.62$$6 llins and "inters6 2$$46 and llins6 etal. 2$$1).

roted ,nd 8earing 5aaity6 7groted

+he groted end earing aaity for ohesionlesssoils is the allated ltimate end earing timesthe +5 (determined from !igre 4). +he grotedend earing aaity for ohesive soils is theltimate allated end earing.



!oring Log /orsheet

!igre 4 - ,0amle 8oring <og ,ntry

Selet "or*ing Units ,nglish or etri nits an e seleted for enteredra data. +he or*sheet ill onvert from

,nglish nits to etri nits and vie versa. +heanalysis ill atomatially se ,nglish nits forthe allations. User efined vales mst eentered in the nits of +S!. Vales in the User

efined olmn ill not e onverted to S/ nits.

,nter Boring Name Boring Name is sed in the grahs foridentifiation.

,nter )round Surface Elevation )round Surface Elevation is the starting elevationof the soil oring.

,nter ,ater Table Elevation ,ater Table Elevation is the elevation of the atertale for that soil oring.

5li* Unprotect ,or-sheet (;tional) Unprotect ,or-sheet tton ill nlo* the entireor*sheet. Proteting the or*sheet ill aid indata entry y alloing the ser to Tab to the ne0tentry.



5li* .ccess +oc- #oring %nformation (;tional) +he .ccess +oc- #oring %nformation tton illallo the ser to enter data for ro* oringinformation (if aliale).



,nter Soil 8oring /nformation

Soil +yes Soil +ye 1: Plasti 5laysSoil +ye 2: 5lay6 Silt6 Sand i06 Silts and arls

Soil +ye 3: 5lean Sands

Soil +ye 4: Soft <imestone6 Very Shelly Sands

Soil +ye : Void (o 5aaity)

!igre - Detailed Soil +yes !orm

Soil 8oring /nformation inldes Deth6 SP+ 6Soil +ye (see Soil Types Commentar+)6 and#o* 5oring /nformation (5omressive Strength6Slitting +ensile Strength6 and Perent #eovery)(if aliale).

5li* Soil Type etails tton ill sho a detailedsoil tye form (!igre 3).

5li* Update Boring Log Udating the oring log ill allate ,levationsand Soil Parameters.



Capacit+ /orsheets4

Capacit+ )lots4

!igre I - Detailed Shaft 5aaity G rot Pressre Plot

;+,: /t shold e noted that all allations are erformed at the ottom of layers6 not the middleof layers. +his ill allate onservative valesand differ from the sers hand allations. +omitigate this effet6 ma*e layer thi*nesses small F

2ft ($.Im).

Ungroted and groted aaities ill e laed ina or*sheet designated for eah diameter ( iam 16

iam =6 and iam >). +he folloing ill einlded in eah or*sheet: No ame6 ShaftDiameter6 8oring mer6 ,levation6 UltimateSide Shear6 Ultimate ,nd 8earing6 Ultimate Shaft5aaity (Ungroted)6 oili=ed Shaft 5aaity(Ungroted and roted)6 and rot Pressre.

+he oili=ed Shaft 5aaity (Ungroted androted) and rot Pressre ill e grahedverss ,levation ( iam1 *lot 6 iam= *lot 6 and

iam> *lot ). An e0amle lot (!igre I) shosload imrovement6 length imrovement6 re7iredgrot ressre for imrovement6 and grah details.

-80

-60

-40

-20

0

20

40

60

0 100 200 300 400 500 600 700 800 900 1000 1100 1200

Caacit tons

E l e v a t i o n

f

-80

-60

-40

-20

0

20

40

600100200300400500600700800

Grot !ressre si

"arra#ona$t %C$&''n#roteCapacity*1+00in,ispGroteCapacity*1+00in,ispGrot !ressre3 ft ,iaeter /orin "3

$oil Ctoff (eroCapacity)

$aft en#tproveent

oaproveent

Grot !ressre'eirefor proveent

!roect +,+

$aft $ie%/orin +,+

Grot !ressreiit(Eipent Constrctioiitations

,is laceent Criteria



)atents

eferences

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8aer in 8roo*lyn QeenRs ,0ressay6 (1?@@) 8aer inner offie +eh ote.

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Vay6 .5. and +onsend6 !.5.6 1??$. Design of So*eted Drilled Shafts in <imestone.

ahn6 . (1?@4)6 O/nnovative 5ement roting6 A5/ Pliation SP-@36 Amerian 5onrete /nstitte6Detroit6 ihigan.

lhay6 !.B. and ayne6 P.". (1??$). anal on ,stimating Soil Proerties for !ondation Design.,letri Poer #esearh /nstitte6 Palo Alto6 5alifornia.

<ittleohn6 . S.6 /ngle6 N.6 Dadasilge6 . (1?@3) O/mrovement in 8ase #esistane of <arge DiameterPiles !onded in Silty Sand Proeedings6 ,ighth ,roean 5onferene on Soil ehanis and!ondation ,ngineering6 Belsin*i6 ay.

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<ogie6 5. V. (1?@4) ODrilled Pier !ondation #ehailitation Using 5ement roting A5/ Pliation SP-@36 /nnovative 5ement roting.

ayne6 P.".6 8ron. D6 Vinson6 N.6 Shneider6 N.A.6 and !in*e6 .A. (2$$$). OSite harateri=ation ofPiedmont residal soils at the ,S6 ;eli*a6 Alaama. A2 Seialty 5onferene on PerformaneVerifiation of 5onstrted eotehnial !ailities6 eotehnial Seial Pliation6 o. ?36 1I$-1@6Amherst6 A.

eyerhof6 ..6 1?CI. 8earing aaity and settlement of iled fondations. Proeedings of theAmerian Soiety of 5ivil ,ngineers6 +36 . 1?C-22@.

oai6 .S.6 and Dffin6 . N. (1??1) O<arge Diameter6 #o* So*et6 8ase roted Piles in 8ristolProeedings of the 4 /nternational 5 th onferene on Piling and Dee !ondations6 Stresa6 /taly6 Aril

llins6 .6 Ashmay6 A.6 and arin6 ,.N. (2$$3). O+he /nflene of "ater +ale in Drilled Shaft5onstrtion - Phase / !inal #eort6 Draft #eort smitted to !lorida Deartment of +ransortation6Nly.

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llins6 . and "inters6 D.6 2$$4. Pressre roting Drilled Shaft +is - Phase //. !inal #eortsmitted !lorida Deartment of +ransortation6 Nne.



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llins6 . and ;Reill6 . (2$$3). OPressre roting Drilled Shaft +is: A !ll-Sale <oad +estProgram6 !inal #eort smitted to +e0as Deartment of +ransortation for A.B. 8e*6 /n. ay6 1I .

llins6 .6 hard6 .6 and hori6 8. (2$$3). OPost roted Drilled Shafts: A 5ase Bistory of +hePA 8olevard 8ridge Proet6 Proeedings of the Dee !ondations /nstitte 2@th Annal 5onferene

llins6 .6 Da6 S.6 and <ai6 P.6 (2$$$). OPressre roting Drilled Shaft +is in Sand. e+ehnologial and Design Develoments in Dee !ondations6 Dennis6 . D.6 et al. (ed.)6 AS5,6 eo/nstitte6 SP Vol. 1$$6 1-1C.

llins6 .6 Da6 S.6 !redreri*6 ,. and "agner6 #.6 2$$$. Pressre roting Drilled Shaft +is. !inal#eort smitted !lorida Deartment of +ransortation6 Deemer.

llins6 . (1???). O/ntervies ith engineers dring load testing on the +aiei !inanial 5enter. +aiei6

;Reill6 .". (2$$2). ODisssion and 5losre of TSide #esistane in Piles and Drilled Shafts. Nornal ofeotehnial and eoenvironmental ,ngineering6 ay6 Vol. 12@6 o. 6 .44I-4$.

;9eill6 .". and Bassan6 ..6 1??4. Drilled Shafts: ,ffets of 5onstrtion on Performane andDesign 5riteria. Proeedings of the /nternational 5onferene on Design and 5onstrtion of Dee

Piione6 .6 5arletti6 .6 and Diamanti6 <. (1?@4) Othe Piled !ondations of the Al a=ira Botel in 5airoProeedings of the /nternational 5onferene on Advanes in Piling and rond +reatment for !ondations6

/nstittion of 5ivil ,ngineers6 <ondon6 U.

#amahandran6 V. S. (1??)6 O5onrete Admi0tres Bandoo*6 Proerties6 Siene6 and +ehnology6Seond ,dition6 oyes Pliation6 Par* #idge6 e Nersy.

#eese6 <.5. and ;9eill6 .".6 1?@@. Drilled Shafts: 5onstrtion and Design. !B"A6 Pliation o.B/-@@-$42.

Shneider6 D./. (1???). An /ntrodtion to Programming Using Visal 8asi I.$ !orth ,dition. PrentieBall6 Uer Saddle #iver6 e Nersey.

#i0om6 #.6 and ailvaganam6 . (1???)6 O5hemial Admi0tres for 5onrete6 +hird ,dition6 #otledge6 e or*6 e or*.

Santosossa6 .6 #i==i6 .6 Diamanti6 <. (1??1) O5onstrtion of Pile !ondation of the Postal 5itadel inthe Diretion 5enter of ales Proeedings of the 4th /nternational 5onferene on Piling and Dee!ondations6 Stresa6 /taly6 Aril



Sedran6 . (1???) O,0erimental and Analytial Stdy of a !rstm 5onfining Vessel6Dotoral Dissertation6 aster University6 Bamilton6 ;6 Setemer.

Sliins*i6 L. N.6 and !lemming6 ". . . (1?@4) Othe /ntegrity and Performane of 8ored PilesProeedings of the /nternational 5onferene on Advanes in Piling and rond +reatment for !ondations6/nstittion of 5ivil ,ngineers6 <ondon6 U.

Sliins*i6 L. N.6 and Philot6 +. A. (1?@$) O5onditions for ,ffetive ,nd 8earing of ored 5ast in SitPiles Proeedings of #eent Develoments in the Design and 5onstrtion of Piles6 /nstitte of 5ivil,ngineers6 <ondon6 U

Sto*er6 .!. (1?@3)6 O+he inflene of ost groting on t he load earing aaity of ored iles6Proeedings6 ,ighth ,roean 5onferene on Soil ehanis and !ondation ,ngineering6 Belsin*i6 ay.

+oma6 !.+. and #eese6 <.5.6 1?C4. 8ehavior of 8ored Piles in Sand. Nornal of the eotehnial,ngineering Division6 Amerian Soiety of 5ivil ,ngineers6 Vol. 1$$6 o. +C6 . C4?-CI1.

+roghton6 V. . and Platis6 A.(1?@?) O+he ,ffets of 5hanges in ,ffetive Stress on a 8ase roted Pilein Sand Proeedings of the /nternational 5onferene on Piling and Dee !ondations6 <ondon6 U6 ay.

Drilled Shaft Calculation

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